[11a-C212-1~12] 3.7 Optical measurement, instrumentation, and sensor

9:15 AM - 9:30 AM JST(12:15 AM - 12:30 AM UTC)

[11a-C212-2] Development of a Terahertz Cavity Spectroscopy System for the Detection and Identification of Trace Gas Mixtures

〇Manato Ikeda¹, Takashi Kawamoto¹, Asahi Suga¹, Shigeki Nashima¹ (1.Osaka metropolitan univ.)

Keywords:

THz wave,cavity

Aiming for the highly sensitive detection and identification of trace gas mixtures, we developed a terahertz cavity spectroscopy system that can be introduced into terahertz time-domain spectroscopy (THz-TDS). We constructed a Fabry-Pérot cavity with a cavity length of 3.75 m to match a general-purpose 80 MHz femtosecond laser, and compensated for the Gouy phase. In the experiment, we observed a 0.85 THz pulse completing 9 laps within the cavity (a propagation distance of approximately 34.4 m), successfully observing THz wave pulses with a detection sensitivity up to approximately 100 times higher than that of general THz-TDS.